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href="/blog/views/JavaScript/JavaScript%20%E6%95%B0%E7%BB%84%E6%93%8D%E4%BD%9C%E6%96%B9%E6%B3%95%E5%A4%A7%E5%85%A8.html#every（）" class="sidebar-link">every（）</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/blog/views/JavaScript/JavaScript%20%E6%95%B0%E7%BB%84%E6%93%8D%E4%BD%9C%E6%96%B9%E6%B3%95%E5%A4%A7%E5%85%A8.html#reduce（）" class="sidebar-link">reduce（）</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/blog/views/JavaScript/JavaScript%20%E6%95%B0%E7%BB%84%E6%93%8D%E4%BD%9C%E6%96%B9%E6%B3%95%E5%A4%A7%E5%85%A8.html#array-from" class="sidebar-link">Array.from( )</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/blog/views/JavaScript/JavaScript%20%E6%95%B0%E7%BB%84%E6%93%8D%E4%BD%9C%E6%96%B9%E6%B3%95%E5%A4%A7%E5%85%A8.html#array-of" class="sidebar-link">Array.of( )</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/blog/views/JavaScript/JavaScript%20%E6%95%B0%E7%BB%84%E6%93%8D%E4%BD%9C%E6%96%B9%E6%B3%95%E5%A4%A7%E5%85%A8.html#find" class="sidebar-link">find( )</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/blog/views/JavaScript/JavaScript%20%E6%95%B0%E7%BB%84%E6%93%8D%E4%BD%9C%E6%96%B9%E6%B3%95%E5%A4%A7%E5%85%A8.html#findindex" class="sidebar-link">findIndex( )</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/blog/views/JavaScript/JavaScript%20%E6%95%B0%E7%BB%84%E6%93%8D%E4%BD%9C%E6%96%B9%E6%B3%95%E5%A4%A7%E5%85%A8.html#includes" class="sidebar-link">includes( )</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/blog/views/JavaScript/JavaScript%20%E6%95%B0%E7%BB%84%E6%93%8D%E4%BD%9C%E6%96%B9%E6%B3%95%E5%A4%A7%E5%85%A8.html#fill" class="sidebar-link">fill( )</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/blog/views/JavaScript/JavaScript%20%E6%95%B0%E7%BB%84%E6%93%8D%E4%BD%9C%E6%96%B9%E6%B3%95%E5%A4%A7%E5%85%A8.html#entries" class="sidebar-link">entries( )</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/blog/views/JavaScript/JavaScript%20%E6%95%B0%E7%BB%84%E6%93%8D%E4%BD%9C%E6%96%B9%E6%B3%95%E5%A4%A7%E5%85%A8.html#keys" class="sidebar-link">keys( )</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/blog/views/JavaScript/JavaScript%20%E6%95%B0%E7%BB%84%E6%93%8D%E4%BD%9C%E6%96%B9%E6%B3%95%E5%A4%A7%E5%85%A8.html#values" class="sidebar-link">values( )</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/blog/views/JavaScript/JavaScript%20%E6%95%B0%E7%BB%84%E6%93%8D%E4%BD%9C%E6%96%B9%E6%B3%95%E5%A4%A7%E5%85%A8.html#flat" class="sidebar-link">flat( )</a><ul class="sidebar-sub-headers"></ul></li><li><a href="/blog/views/JavaScript/JavaScript%20%E6%95%B0%E7%BB%84%E6%93%8D%E4%BD%9C%E6%96%B9%E6%B3%95%E5%A4%A7%E5%85%A8.html#复制数组" class="sidebar-link">复制数组</a><ul class="sidebar-sub-headers"></ul></li></ul></section></li></ul> </aside> <div class="password-shadow password-wrapper-in" style="display:none;" data-v-6cbeab0a data-v-4698c43e><h3 class="title" style="display:none;" 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          <span data-v-6cbeab0a>2019 - </span>
          2020
        </a></span></div></div> <div data-v-4698c43e><main class="page"><!----> <div class="page-title" style="display:none;"><h1>JavaScript 数组操作方法大全</h1> <hr> <div data-v-484a899e><i class="iconfont reco-account" data-v-484a899e><span data-v-484a899e>时间领主</span></i> <i class="iconfont reco-date" data-v-484a899e><span data-v-484a899e>2019-08-01</span></i> <!----> <i class="iconfont reco-tag tags" data-v-484a899e><span class="tag-item" data-v-484a899e>
      JavaScript
    </span></i></div></div> <div class="theme-reco-content content__default" style="display:none;"><h1 id="javascript-数组操作方法大全"><a href="#javascript-数组操作方法大全" class="header-anchor">#</a> JavaScript 数组操作方法大全</h1> <blockquote><p>因为我经常碰到数组的操作问题，并且数组的一些方法和字符串很像，所以我打算整合出来，省得每次百度，直接看自己的博客岂不美哉,来自MDN</p></blockquote> <h2 id="push"><a href="#push" class="header-anchor">#</a> push</h2> <ul><li>语法: array.push(item1, item2, …, itemX)</li> <li>push( )方法：可以将一个或者更多的参数添加在数组的尾部；<strong>返回添加后的数组的长度</strong>，原数组发生改变。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>var arr=[1,2,3,4];
var a=arr.push(9,8,7);
console.log(a,arr); //1,2,3,4,9,8,7；
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><h2 id="unshift"><a href="#unshift" class="header-anchor">#</a> unshift</h2> <ul><li>语法: array.unshift(item1,item2, …, itemX)</li> <li>unshift( )方法：可以将一个或者更多的参数添加在数组的头部；返回添加后的数组的长度，原数组发生改变。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>var arr=[1,2,3,4];
var a=arr.unshift(9,8,7);
console.log(a,arr);//9,8,7,1,2,3,4；
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><h2 id="pop"><a href="#pop" class="header-anchor">#</a> pop</h2> <ul><li>语法：array.pop()</li> <li>pop( )方法：从数组尾部删除一个元素，返回这个被删除的元素，原数组发生改变。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>var arr=[1,2,3,4];
var a=arr.pop();
console.log(a,arr)//4；1,2,3，
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><h2 id="shift"><a href="#shift" class="header-anchor">#</a> shift</h2> <ul><li>语法：array.shift()</li> <li>shift( ) 方法：从数组头部删除一个元素，返回这个被删除的元素，原数组发生改变。</li> <li>代码示例如下:</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>var arr = [1,2,3,4];
var a = arr.shift();
console.log(a,arr)//1；2,3,4，
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><h2 id="slice"><a href="#slice" class="header-anchor">#</a> slice</h2> <ul><li>语法：array.slice(start, end)</li> <li>slice（）方法：如果不传参数，会返回原数组；如果一个参数，从该参数表示的索引开始截取，直至数组结束，返回这个截取数组，原数组不变；
两个参数，从第一个参数对应的索引开始截取，到第二个参数对应的索引结束，但包括第二个参数对应的索引上的值，原数组不改变 &amp;最多接受两个参数</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>var fruits = [&quot;Banana&quot;, &quot;Orange&quot;, &quot;Lemon&quot;, &quot;Apple&quot;, &quot;Mango&quot;];
var citrus = fruits.slice(1,3);
console.log(citrus )//Orange,Lemon
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><h2 id="splice"><a href="#splice" class="header-anchor">#</a> splice</h2> <ul><li>语法：array.splice(index,howmany,item1,…,itemX)</li> <li>splice( ) 方法：没有参数，返回空数组，原数组不变；
一个参数，从该参数表示的索引位开始截取，直至数组结束，返回截取的 数组，原数组改变；
两个参数，第一个参数表示开始截取的索引位，第二个参数表示截取的长度，返回截取的 数组，原数组改变；
三个或者更多参数，第三个及以后的参数表示要从截取位插入的值。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>var fruits = [&quot;Banana&quot;, &quot;Orange&quot;, &quot;Apple&quot;, &quot;Mango&quot;];
fruits.splice(2,2);
console.log(fruits )//Banana,Orange
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><h2 id="reverse"><a href="#reverse" class="header-anchor">#</a> reverse</h2> <ul><li>语法：array.reverse()</li> <li>reverse( )方法：用于颠倒数组中元素的顺序</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>var fruits = [&quot;Banana&quot;, &quot;Orange&quot;, &quot;Apple&quot;, &quot;Mango&quot;];
fruits.reverse();
console.log(fruits)//Mango,Apple,Orange,Banana
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><h2 id="sort"><a href="#sort" class="header-anchor">#</a> sort</h2> <ul><li>语法：array.sort(sortfunction)</li> <li>sort( ) 方法：用于对数组的元素进行排序。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>var Array = [1,2,3,4,5];
var fruits = Array.sort(function(a,b){
	//return a - b; //从小到大
	return b-a; //从大到小
})
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><h2 id="join"><a href="#join" class="header-anchor">#</a> join</h2> <ul><li>语法：array.join(separator)</li> <li>join( ) 方法：于把数组中的所有元素转换一个字符串,元素是通过指定的分隔符进行分隔的。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>var arr = [1,2,3,4]
var bbc = arr.join()
console.log(bbc)//1,2,3,4
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><h2 id="concat"><a href="#concat" class="header-anchor">#</a> concat</h2> <ul><li>语法：string.concat(string1, string2, …, stringX)</li> <li>concat( ) 方法：属于字符串的方法，数组也可以用，接受一个或多个参数，将参数中的值放到操作的数组后边，返回拼接的数组，原数组不变。如果参数是一个数组，则先把值提取出来再操作。</li> <li>代码示例如下</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>var arr = [1,2,3,4];
arr.concat([5,6,7])//[1,2,3,4,5,6,7]
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h1 id="es5新增的一些数组方法"><a href="#es5新增的一些数组方法" class="header-anchor">#</a> ES5新增的一些数组方法</h1> <h2 id="indexof（）"><a href="#indexof（）" class="header-anchor">#</a> indexOf（）</h2> <ul><li>语法：string.indexOf(searchvalue,start)</li> <li>indexOf( ) 方法：字符串的方法，数组也可适用，此方法可返回某个指定的字符串值在字符串中首次出现的位置；若一个参数，返回这个参数在数组里面的索引值，如果参数不在操作的数组中，则返回 -1。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>var arr = [1,2,3,4];
arr.indexOf(1) // 0
arr.indexOf(5) // -1 
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><h2 id="foreach（）"><a href="#foreach（）" class="header-anchor">#</a> forEach（）</h2> <ul><li>语法：array.forEach(function(currentValue, index, arr), thisValue)</li> <li>forEach( ) 方法：数组遍历，且只能够遍历数组，不接受返回值或返回值为 undefined。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>var arr = [1,2,3,4,5];
arr.forEach((item,index,arr)=&gt;{
   //item 为当前数组元素
   // index 为当前索引
   // arr 为数组名字
})
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><h2 id="map（）"><a href="#map（）" class="header-anchor">#</a> map（）</h2> <ul><li>语法：array.map(function(currentValue,index,arr), thisValue)</li> <li>map( ) 方法：数组的遍历，用来接收一个返回值，创建一个新数组，不改变原数组。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>var arr = [1,2,3,4,5,6];
arr.map(function(item,index,arr){
	return item * 2
})
//输出 [2,4,6,8,10,12]
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><h2 id="filter（）"><a href="#filter（）" class="header-anchor">#</a> filter（）</h2> <ul><li>语法：array.filter(function(currentValue,index,arr), thisValue)</li> <li>filter( ) 方法：过滤出一些符合条件的元素，返回一个新数组。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>var ages = [32, 33, 16, 40];

function checkAdult(age) {
    return age &gt;= 18;
    //返回数组 ages 中所有元素都大于 18 的元素:
}
function myFunction() {
    document.getElementById(&quot;demo&quot;).innerHTML = ages.filter(checkAdult);
}
//输出结果为：32,33,40
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><h2 id="some（）"><a href="#some（）" class="header-anchor">#</a> some（）</h2> <ul><li>语法：array.some(function(currentValue,index,arr),thisValue)</li> <li>some( ) 方法：检测数组中是否含有某一个值，返回一个布尔值，如果- 数组中有任意一个元素满足给定的条件，结果就为 true否则false。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>var ages = [3, 10, 18, 20];

function checkAdult(age) {
    return age &gt;= 18;
}
function myFunction() {
    document.getElementById(&quot;demo&quot;).innerHTML = ages.some(checkAdult);
}
//输出结果为：true
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><h2 id="every（）"><a href="#every（）" class="header-anchor">#</a> every（）</h2> <ul><li>语法：array.every(function(currentValue,index,arr), thisValue)</li> <li>every( ) 方法：方法用于检测数组所有元素是否都符合指定条件（通过函数提供）,返回一个布尔值,结果为 true或false。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>var ages = [32, 33, 16, 40];

function checkAdult(age) {
    return age &gt;= 18;
    //检测数组 ages 的所有元素是否都大于等于 18 
}

function myFunction() {
    document.getElementById(&quot;demo&quot;).innerHTML = ages.every(checkAdult);
}
//输出结果为：false
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><h2 id="reduce（）"><a href="#reduce（）" class="header-anchor">#</a> reduce（）</h2> <ul><li>语法：array.reduce(function(total, currentValue, currentIndex, arr), initialValue)</li> <li>reduce( ) 方法：对数组中的所有元素调用指定的回调函数，该回调函数的返回值为累计结果。并且把返回值在下一次回调函数时作为参数提供。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>var numbers = [65, 44, 12, 4];
 
function getSum(total, num) {
    return total + num;
    //计算数组相加的总和
}
function myFunction(item) {
    document.getElementById(&quot;demo&quot;).innerHTML = numbers.reduce(getSum);
}
//输出结果为：125

</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><h1 id="es6新增的数组方法"><a href="#es6新增的数组方法" class="header-anchor">#</a> ES6新增的数组方法</h1> <h2 id="array-from"><a href="#array-from" class="header-anchor">#</a> Array.from( )</h2> <ul><li>语法：Array.from(arrayLike[, mapFn[, thisArg]])</li> <li>Array.from( ) 方法：将类数组对象或可迭代对象转化为数组，比如arguments，js选择器找到dom集合和对象模拟的数组。</li> <li>代码示例如下:</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>// 参数为数组,返回与原数组一样的数组
console.log(Array.from([1, 2])); // [1, 2] 
// 参数含空位
console.log(Array.from([1, , 3])); // [1, undefined, 3]
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h2 id="array-of"><a href="#array-of" class="header-anchor">#</a> Array.of( )</h2> <ul><li>Array.of( ) 方法：数组创建，将参数中所有值作为元素形成数组，如果参数为空，则返回一个空数组。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>console.log(Array.of(1, 2, 3, 4)); // [1, 2, 3, 4] 
// 参数值可为不同类型
console.log(Array.of(1, '2', true)); // [1, '2', true] 
// 参数为空时返回空数组
console.log(Array.of()); // []
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><h2 id="find"><a href="#find" class="header-anchor">#</a> find( )</h2> <ul><li>find( ) 方法：查找数组中符合条件的元素,若有多个符合条件的元素，则返回第一个元素。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>let arr = Array.of(1, 2, 3, 4);
console.log(arr.find(item =&gt; item &gt; 2)); // 3 
// 数组空位处理为 undefined
console.log([, 1].find(n =&gt; true)); // undefined
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h2 id="findindex"><a href="#findindex" class="header-anchor">#</a> findIndex( )</h2> <ul><li>查找数组中符合条件的元素索引，若有多个符合条件的元素，则返回第一个元素索引。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>let arr = Array.of(1, 2, 1, 3);
// 参数1：回调函数
// 参数2(可选)：指定回调函数中的 this 值
console.log(arr.findIndex(item =&gt; item == 1)); // 0
// 数组空位处理为 undefined
console.log([, 1].findIndex(n =&gt; true)); //0
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><h2 id="includes"><a href="#includes" class="header-anchor">#</a> includes( )</h2> <ul><li>includes( ) 方法：检测数组中是否包含一个值。</li> <li>注意：与 Set 和 Map 的 has 方法区分；Set 的 has 方法用于查找值；Map 的 has 方法用于查找键名。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>// 参数1：包含的指定值
[1, 2, 3].includes(1);    // true
// 参数2：可选，搜索的起始索引，默认为0
[1, 2, 3].includes(1, 2); // false
// NaN 的包含判断
[1, NaN, 3].includes(NaN); // true
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><h2 id="fill"><a href="#fill" class="header-anchor">#</a> fill( )</h2> <ul><li>fill( ) 方法：将一定范围索引的数组元素内容填充为单个指定的值。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>let arr = Array.of(1, 2, 3, 4);
// 参数1：用来填充的值
// 参数2：被填充的起始索引
// 参数3(可选)：被填充的结束索引，默认为数组末尾
console.log(arr.fill(0,1,2)); // [1, 0, 3, 4]
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><h2 id="entries"><a href="#entries" class="header-anchor">#</a> entries( )</h2> <ul><li>entries( ) 方法：遍历键值对。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>for(let [key, value] of ['a', 'b'].entries()){
    console.log(key, value);
}
// 0 &quot;a&quot;
// 1 &quot;b&quot; 
// 不使用 for... of 循环
let entries = ['a', 'b'].entries();
console.log(entries.next().value); // [0, &quot;a&quot;]
console.log(entries.next().value); // [1, &quot;b&quot;]
 
// 数组含空位
console.log([...[,'a'].entries()]); // [[0, undefined], [1, &quot;a&quot;]]
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br></div></div><h2 id="keys"><a href="#keys" class="header-anchor">#</a> keys( )</h2> <ul><li>keys( ) 方法：遍历键名。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>for(let key of ['a', 'b'].keys()){
    console.log(key);
}
// 0
// 1 
// 数组含空位
console.log([...[,'a'].keys()]); // [0, 1]
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><h2 id="values"><a href="#values" class="header-anchor">#</a> values( )</h2> <ul><li>values( ) 方法：遍历键值。</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>for(let value of ['a', 'b'].values()){
    console.log(value);
}
// &quot;a&quot;
// &quot;b&quot;
// 数组含空位
console.log([...[,'a'].values()]); // [undefined, &quot;a&quot;]
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><h2 id="flat"><a href="#flat" class="header-anchor">#</a> flat( )</h2> <ul><li>嵌套数组转一维数组</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>console.log([1 ,[2, 3]].flat()); // [1, 2, 3] 
// 指定转换的嵌套层数
console.log([1, [2, [3, [4, 5]]]].flat(2)); // [1, 2, 3, [4, 5]] 
// 不管嵌套多少层
console.log([1, [2, [3, [4, 5]]]].flat(Infinity)); // [1, 2, 3, 4, 5]
// 自动跳过空位
console.log([1, [2, , 3]].flat());&lt;p&gt; // [1, 2, 3]
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><h2 id="复制数组"><a href="#复制数组" class="header-anchor">#</a> 复制数组</h2> <ul><li>…：扩展运算符</li> <li>代码示例如下：</li></ul> <div class="language- line-numbers-mode"><pre class="language-text"><code>let arr = [1, 2],
    arr1 = [...arr];
console.log(arr1); // [1, 2]
 
// 数组含空位
let arr2 = [1, , 3],
    arr3 = [...arr2];
console.log(arr3); [1, undefined, 3]
//合并数组
console.log([...[1, 2],...[3, 4]]); // [1, 2, 3, 4]
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div></div> <footer class="page-edit" style="display:none;"><!----> <div class="last-updated"><span class="prefix">最后更新时间: </span> <span class="time">4/4/2020, 8:45:17 PM</span></div></footer> <!----> <!----></main> <!----> <div class="comments-wrapper" data-v-4698c43e><!----></div></div></div></div></div></div><div class="global-ui"><div class="back-to-ceiling" style="right:1rem;bottom:6rem;width:2.5rem;height:2.5rem;border-radius:.25rem;line-height:2.5rem;display:none;" data-v-a81d141e data-v-a81d141e><svg t="1574745035067" viewBox="0 0 1024 1024" version="1.1" xmlns="http://www.w3.org/2000/svg" p-id="5404" class="icon" data-v-a81d141e><path d="M526.60727968 10.90185116a27.675 27.675 0 0 0-29.21455937 0c-131.36607665 82.28402758-218.69155461 228.01873535-218.69155402 394.07834331a462.20625001 462.20625001 0 0 0 5.36959153 69.94390903c1.00431239 6.55289093-0.34802892 13.13561351-3.76865779 18.80351572-32.63518765 54.11355614-51.75690182 118.55860487-51.7569018 187.94566865a371.06718723 371.06718723 0 0 0 11.50484808 91.98906777c6.53300375 25.50556257 41.68394495 28.14064038 52.69160883 4.22606766 17.37162448-37.73630017 42.14135425-72.50938081 72.80769204-103.21549295 2.18761121 3.04276886 4.15646224 6.24463696 6.40373557 9.22774369a1871.4375 1871.4375 0 0 0 140.04691725 5.34970492 1866.36093723 1866.36093723 0 0 0 140.04691723-5.34970492c2.24727335-2.98310674 4.21612437-6.18497483 6.3937923-9.2178004 30.66633723 30.70611158 55.4360664 65.4791928 72.80769147 103.21549355 11.00766384 23.91457269 46.15860503 21.27949489 52.69160879-4.22606768a371.15156223 371.15156223 0 0 0 11.514792-91.99901164c0-69.36717486-19.13165746-133.82216804-51.75690182-187.92578088-3.42062944-5.66790279-4.76302748-12.26056868-3.76865837-18.80351632a462.20625001 462.20625001 0 0 0 5.36959269-69.943909c-0.00994388-166.08943902-87.32547796-311.81420293-218.6915546-394.09823051zM605.93803103 357.87693858a93.93749974 93.93749974 0 1 1-187.89594924 6.1e-7 93.93749974 93.93749974 0 0 1 187.89594924-6.1e-7z" p-id="5405" data-v-a81d141e></path><path d="M429.50777625 765.63860547C429.50777625 803.39355007 466.44236686 1000.39046097 512.00932183 1000.39046097c45.56695499 0 82.4922232-197.00623328 82.5015456-234.7518555 0-37.75494459-36.9345906-68.35043303-82.4922232-68.34111062-45.57627738-0.00932239-82.52019037 30.59548842-82.51086798 68.34111062z" p-id="5406" data-v-a81d141e></path></svg></div></div></div>
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